node Buffer(详细)

1. 创建Buffer的方法

(1) let  buf = Buffer.from('Hey!')
(2) let buf = Buffer.alloc(4); //创建4个字节

2. 将Buffer转成字符串

const buf = Buffer.from('Hey!')
console.log(buf.toString()) //Hoy!

3. 对Buffer字节进行读改删

//读
const buf = Buffer.from('Hey!')
console.log(buf[0]) //72
console.log(buf[1]) //101
console.log(buf[2]) //121

//迭代读取
const buf = Buffer.from('Hey!')
for (const item of buf) {
    
    
  console.log(item) //72 101 121 33
}

// 改
const buf = Buffer.from('Hey!')
buf[1] = 111 //o
console.log(buf.toString()) //Hoy!

// 删
const buf = Buffer.from('Hey!')
buf.slice(0).toString() //Hey!
const slice = buf.slice(0, 2)
console.log(slice.toString()，slice.length) //He 2

总结Buffer和array挺像的都有length属性和slice方法，其迭代和读取方法也类似

更详细相关内容可以点击链接Node.js Buffer.进行访问